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6. KARAOKE Circuit (KARAOKE MODEL ONLY)
Replace VR803.
Replace the IC5M1.
Check pattern.
Start
Insert the Mic jack
Is the Mic signal at the
IC802 pin1.
YES
NO
Does the signal change
at the IC802 Pin1 if adjusting the VR803
(Echo VR)?
YES
Is the Digital
NO
signal output at the
IC5M1 Pin1.
YES
Does the Mic
NO
signal input the IC501 Pins
70, 76, 78, 79.
YES
Replace IC501.
NO
Is the Mic signal at the
IC802 Pin 2.
NO
Is the Mic signal at the
IC801 Pin 3, 7 normal?
Replace the VR801.
3-12
Replace IC801.
NO
Replace the mic jack
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